EP0187319B1 - Mécanisme de guidage de bande pour dispositifs d'entraînement de bande, particulièrement dispositifs de bande magnétique, et cassettes à bande avec ce mécanisme - Google Patents

Mécanisme de guidage de bande pour dispositifs d'entraînement de bande, particulièrement dispositifs de bande magnétique, et cassettes à bande avec ce mécanisme Download PDF

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Publication number
EP0187319B1
EP0187319B1 EP85116041A EP85116041A EP0187319B1 EP 0187319 B1 EP0187319 B1 EP 0187319B1 EP 85116041 A EP85116041 A EP 85116041A EP 85116041 A EP85116041 A EP 85116041A EP 0187319 B1 EP0187319 B1 EP 0187319B1
Authority
EP
European Patent Office
Prior art keywords
tape
guide
guide belt
holding
end sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85116041A
Other languages
German (de)
English (en)
Other versions
EP0187319A1 (fr
Inventor
Klaus Schoettle
Lothar Gliniorz
Kurt Schmidts
Eugen Kamm
Herbert Dietze
Wulf Dr. Muenzner
Dieter Gaiser
Artur Buhk
Juergen Dreyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19848438028 external-priority patent/DE8438028U1/de
Priority claimed from DE19858516444 external-priority patent/DE8516444U1/de
Application filed by BASF SE filed Critical BASF SE
Priority to AT85116041T priority Critical patent/ATE44328T1/de
Publication of EP0187319A1 publication Critical patent/EP0187319A1/fr
Application granted granted Critical
Publication of EP0187319B1 publication Critical patent/EP0187319B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G11B23/041—Details
    • G11B23/047—Guiding means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/605—Guiding record carrier without displacing the guiding means

Definitions

  • Tape guide device for tape transport devices in particular magnetic tape devices, in particular tape cassettes, consisting of a flexible guide tape resting on an at least partially dimensionally stable base body with a defined surface, which forms the guide surface for the magnetic tape, and which has a greater length than the length of the peripheral contour of the base body, and the protruding end portions of the guide tape are held together, and a tape cassette with such a tape guide device.
  • tape guides in particular fixed guides, for thin, flexible, smooth, strip-shaped tapes, in particular magnetic tapes in cassettes and / or devices for holding or for low-friction and damage-free guidance of the tapes during all movement processes, e.g. B. when rewinding, recording or playback, the tape is known.
  • tape guides have become known from DE-A-28 17 318, which consist of metallic hollow cylinder bodies which are bent from a sheet metal strip and which are designed with at least one incision for engaging an extension of the cassette housing.
  • the production of this hollow cylinder from the sheet metal strip offers no significant advantages of a functional or economical nature.
  • a possible partial machining of the surface of the hollow cylinder body is also not advisable, since with small diameters of the guide elements with known processing machines (eg devices for centerless grinding) a cylinder surface is lighter and is faster to process than just part of it.
  • DE-C-2 535 276 discloses a large-area band guide which consists of a solid base body and a spring-elastic metal strip attached to it and deformed in Hook's area and fastened under tensile stress. The attachment under tensile stress takes place in order to form a concave guide surface for the magnetic tape.
  • a curved guide surface is also to be formed using a sufficiently thin strip material "for which the surface of the base body must be suitably shaped so that the strip conforms to it in the desired manner in a tensioned position".
  • this strip is made of V2A steel and has a thickness in the range of 0.4 mm (400 K m).
  • the invention is also intended to provide tape cassettes with such tape guide devices.
  • the object is achieved with a tape guide device or a tape cassette of the type defined in the introduction in that the thickness of the guide tape is at most about 150 ... m, so that the guide surface is solely due to the outer shape and / or the surface shape of the base body and the Surface quality of the guide belt is determined and that at least one dimensionally stable, arranged on the base body or in the vicinity of the base body and in the position to the base body unchangeable holding element is provided for the torsion-proof mounting of the protruding end portions of the guide belt.
  • a thickness of the guide band in the range between approximately 10 .mu.m and 50 .mu.m is expedient.
  • the guide band can consist of a resilient material.
  • the guide band can be held on the base body and / or on the holding element by means of clamping.
  • the base body is expediently at least partially designed with a cylindrical surface.
  • the holding element can simply be designed with a slot or groove, in particular as a slotted cylinder body, for receiving the end sections of the guide band. It is also possible to use two holding projections arranged next to one another at a distance. If the tape transport device is a tape cassette, the holding element can at least partially consist of a housing wall. The holding elements in the cassette are expediently injection molded onto the cassette housing.
  • the end sections of the guide band can be connected to one another, which, after manufacture, enables simple insertion into the holding element or elements.
  • the end sections can also be connected in such a way that each end section is curved away from the longitudinal axis, which makes it easier to clamp them on the holding element.
  • a guide band with an omega cross-sectional shape is advantageous, but a drop or pear shape in the inserted position is also favorable.
  • the end sections of the guide band are provided with fastening openings, which makes it easy to fasten the guide band to the cylinder body.
  • the cylinder body is designed with a fastening slot, which can also be used to prevent rotation.
  • the cylinder body is made as a separate part and consists in particular of polystyrene.
  • the cylinder body which can be manufactured as a mass part, can thus be produced very economically.
  • a radially and axially central pin is provided as a holding element on the cylinder body.
  • the cylinder body and guide band can expediently be designed as a preassembled unit, which comprise fastening devices.
  • the guide devices described above are also the subject of the invention in connection with tape cassettes.
  • FIG. B The typical tape course in a conventional VHS video cassette 20 is shown in FIG. B. coming from the coil 3 with its layer side over a cylindrical metal pin 5 (Fig.2a), which is pressed into a corresponding recess of the cassette housing 21 made of plastic.
  • the tape 2 is then deflected on the guide 6a, which is also fixed, and is guided along the cassette front 22 to the guide 6b.
  • the guides 6a and 6b usually consist of seamless metallic hollow cylinders (FIG. 2b) or are bent from a sheet metal strip into a hollow cylinder (6 'in FIG. 2c) (according to DE-A-28 17 318). From the guide 6b, the tape 2 is guided past the line roller 7 to the spool 4 and wound up there.
  • FIG. 3 shows tape guide devices 10a and 11a as well as 10b and 11b according to the invention, which correspond to the known guide elements 6a and 6b in the arrangement in the cassette 20, but, as will become apparent below, have significant advantages over the prior art.
  • a guide element 10a or 10b according to the invention is shown in perspective on a larger scale in FIG.
  • a guide belt 8 consists of film material such. B. a metal foil and has, for. B. by bending, deformed bent or kinked outer edges 9a and 9b.
  • the film is compressed from its extended position into an arcuate shape and placed over a post 10.
  • the film compressed in the shape of drops or pears has a diameter which is somewhat smaller than the diameter of the post 10.
  • the post 10 can be provided with an insertion bevel (not shown) for easier assembly of the bent metal foil 8 and, as a rule, slightly higher or lower (z. B. about half as high) as the width of the metal foil 8.
  • a holding element here designed as a slotted hollow cylinder 11, is provided in the immediate vicinity of the post 10.
  • the slot 12 has a width that is at least somewhat larger than twice the thickness D of the guide belt 8.
  • the slotted hollow cylinder 11 is selected to be approximately the same height as the post 10. As tests have shown, however, the guide band is still sufficiently secured in its position when the slotted hollow cylinder 11 is only approximately half the height of the post 10 .
  • the guide band can also be inserted or clamped between the upper and lower parts (possibly the cassette housing).
  • a security pin 23 is shown, which tapers slightly conically and attached to the cover part of the housing 21, for. B. molded, can be.
  • the film 8 engages in the opening of the slotted hollow cylinder 11, if desired, so that it can also be fixed.
  • Figure 5 shows a tape guide device as a replacement for the guide pin 5 (Fig. 1).
  • the guide device according to the invention is formed by means of a pin 13 which is connected in one piece to the housing 21, the guide band 8 'is bent around this pin (an intermediate form of the band shown in dashed lines is shown in FIG. 5A) and with its bent outer edges 9a', 9b 'between am Housing 21 attached holding elements, here between holding projections 14a and 14b, hung.
  • the lower dimensioning limit given above for the slot 12 applies to the distance 12 'of the holding projections 14a and 14b from one another.
  • Protrusions 14a and 14b can expediently be formed in one piece with lateral housing walls 24. Otherwise, the walls themselves or slots or grooves in inner wall parts of the housing 21 can also be used for the holding purpose.
  • holding elements are separate clamping elements which clamp the ends of the guide band together.
  • FIG. 6 A further advantageous form of the tape guide device according to the invention is shown in FIG. 6, in which the guide tape 8 "consists of a middle part 16, the length of which is selected to be slightly smaller than the circumference of the pin 13.
  • the bent edges 15a and 15b, which are elongated relative to the guide tape 8 ', are in turn supported on the projections 14a and 14b.
  • the guide band 8 " possibly by spring action, automatically fits tightly on the largest part of the pin circumference and cannot slip, even if there is a further bend 17a / b of the guide band ends for hanging on the housing projections 14a / b is dispensed with.
  • This version requires a resilient material, but this does not have to be the case with the other versions.
  • Figures 7 and 8 show a further embodiment of the tape guide device, which differs from the other embodiments in that the end portions 26, 26 'of the guide tape 25, 25' are connected to each other before assembly, for. B. by spot welding or by other known connection methods, such as. B. flanging the ends etc.
  • the end sections 26, 26 ' are connected at the top and bottom at the points 18a / b and the middle parts 19a and 19b of the end sections 26 are bent away from one another or from their longitudinal axis so that they bulge w is slightly larger than the width of the slot 12 of the slot hollow cylinder 11 or as the distance 12 'between the projections 14a and 14b.
  • the tape guide according to the invention offers exceptionally great economic advantages.
  • the material saving alone is more than 80% when using a 30 ⁇ m thick metal foil, and even more with a 20 ⁇ m foil.
  • the invention also has advantages in terms of logistics and assembly, since the guide belt can be obtained as a tape wrap and can be processed particularly cheaply in an automatic production.
  • the material used is advantageously commercial, drawn or rolled high-alloy, spring-hard non-magnetic stainless steel with a tensile strength of approximately 500 to 1200 N / m and a surface roughness of R z ⁇ 2 wm, preferably ⁇ 1 ⁇ m.
  • a metal foil is expediently used so that the rolling or drawing direction is parallel to the direction of the magnetic tape.
  • Surface drawn and / or rolled foils are particularly cheap because, among other things, they do not have any pointed or sharp surface structures, which is very beneficial for a gentle belt run. Of course, the use of other metal foils is also possible.
  • the metal foils can also be subjected to a previous special surface treatment, plating, lapping, polishing, lubricating, etc. If special surface structures are desired, these can be done in a simpler way; Imprint the way of the metal foil continuously.
  • the tape guide according to the invention can also be produced using a plastic film.
  • plastic film are suitable for.
  • films made of high-strength and resistant plastics such as polyamideimide, polyetherimide, polysulfones, polyphenylene sulfide, etc.
  • the thickness of the guide band is (first) not more than about 150 W m or (secondly) is at most 100 microns and is practically advantageous as between about 10 and 50 microns, or about 10 and 80 microns.
  • Metal foils with 30 and 20 ⁇ m thickness have proven to be excellent, but other materials with other thicknesses can also be used.
  • This thickness dimensioning ensures that the surface texture based on rough machining (microstructures) on the posts 10 or 13 is covered by the guide belt and the surface can thereby easily obtain a high surface quality.
  • the thickness can also be chosen so that the surface shape (macro structures), e.g. B. a pattern on the post, is molded outwards, for. B. to produce a desired ripple of the guide surface.
  • Special band guide cross-sectional contours i.e. external shapes
  • the range from approx. 10 to approx. 80 ⁇ m of a metal foil, e.g. B. a spring steel foil, ensures in any case that there is sufficient flexibility of the guide belt in any case. With other materials, these areas can be somewhere else, but in any case below 150> m.
  • Base body and holding elements according to the present invention can be formed on one or more housing parts such as pins, pins, walls, etc., or be supported on them.
  • FIGS. 9 to 12 A further embodiment of the guiding device is shown in FIGS. 9 to 12.
  • Figure 9 shows the z. B. cut from the metal foil strip, punched and bent at the ends 31, 32 each once bent metal foil strip 27.
  • the bending angle ⁇ is preferably selected ⁇ 90 ° (less than 90 °) and> 45 ° (greater than 45 °).
  • the cylinder body shown as a support sleeve 29 in Fig. 10, consists of an economically producible, easily processed by injection molding plastic, for. B. polystyrene. Appropriately on a surface line of the cylinder outer surface, two cutouts 33 are arranged as fastening slots and a radially projecting short pin 28.
  • the metal foil strip 27 When mounting the metal foil strip 27 on the support sleeve 29, for example, as shown in FIG. 11, first the opening 30a is hooked onto the pin 29, the metal foil strip 27 is wrapped around the cylinder outer surface 34 of the support sleeve 29 and then at the other end also at the opening 36 Pin 28 suspended.
  • the metal foil 27 * has so much resilient flexibility at the bending or buckling edges 35 and 36 that this process is easy to carry out and that the metal foil 27 automatically catches after being hung on the pin 28 and can only be dismantled therefrom with tools.
  • the tape guide device or metal foil guide preassembled in this way can then be stored in a magazine and fed to the cassette assembly device for automatic assembly. There it can then be inserted into the lower part of the cassette housing 37 shown in FIG. B. be plugged onto a hollow pin 39a.
  • This hollow pin 39 has, for example on its foot on its side facing away from the belt path, a projection 40 which engages in a slot 33 of the support sleeve 29 and prevents it from rotating.
  • a correspondingly shaped housing rib bears on the flattened surface 41 of the attached metal foil 27 or on the pin 28 of the support sleeve 29.
  • the upper housing part 38 is placed with the upper hollow pin 39b and z. B. screwed with screws 42.
  • the support sleeve 29 with the film 27 into a circular groove in the lower housing part 37, which may also be present in the upper part 38.
  • the sleeve 29 can be fixed in practice by screws in these cases.
  • the construction of the tape guide element according to the invention consisting of metal foil and a support body that can be separated from the tape transport device, has the advantage that significant changes to the tape transport device, in particular to a tape cassette, are not necessary.
  • the pre-assembly on the support body, in particular the support sleeves, requires z. B. only minor modifications to the cassette housing, which can be easily removed from existing tools.
  • the assembly of the sleeves is possible with conventional machines. If the described tape guide devices can also primarily reproduce or subsequently perfect fixed tape guide elements, movably arranged, e.g. B. pivotable or slidable guides with the same advantages.

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  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (20)

1. Dispositif de guidage de bande pour appareils de transport de bande, en particulier, appareils à bande magnétique, en particulier cassettes de bandes, constitué d'une bande de guidage flexible reposant par des surfaces définies sur un corps de base (10, 13) de forme au moins partiellement stable, bande qui forme surface de guidage pour la bande magnétique et qui a une longueur supérieure à celle du contour périphérique du corps de base (10, 13) et les sections d'extrémité de la bande de guidage qui dépassent sont retenues ensemble, caractérisé par le fait que l'épaisseur (D) de la bande de guidage (8, 8', 8", 25, 26, 27) est au maximum d'environ 150 >m, de sorte que la surface de guidage est déterminée exclusivement par la forme extérieure et/ou la forme de surface du corps de base (10, 13, 29), ainsi que la caractéristique de surface de la bande de guidage (8, 8', 8", 25, 26, 27) et qu'il est prévu au moins un élément de retenue (11, 14a et 14b, 24, 28) de forme stable disposé contre le corps de base ou au voisinage du corps de base et invariable en position par rapport au corps de base, pour maintenir à l'abri de toute torsion les sections d'extrémités dépassantes (9a, 9b, 9a', 9b', 26, 26', 31, 32) de la bande de guidage.
2. Dispositif selon la revendication 1, caractérisé par une épaisseur (D) de la bande de guidage comprise entre environ 10 µm et 50 >m.
3. Dispositif selon la revendication 1 ou 2, caractérisé par le fait que la bande de guidage (8, 8', 8", 25, 25') est en une matière à élasticité de ressort.
4. Dispositif selon la revendication 1 ou 3, caractérisé par le fait que la bande de guidage (8, 8', 8", 25, 25') est maintenue par serrage contre le corps de base (10, 13) et/ou l'élément de retenue (11, 14a et 14b).
5. Dispositif selon la revendication 1, caractérisé par le fait que l'élément de retenue (11) présente au moins une fente (12) ou une rainure pour recevoir les sections d'extrémité (9a, 9b, 9a', 2b, 2b').
6. Dispositif selon la revendication 5, caractérisé par le fait que l'élément de retenue est un corps cylindrique fendu (11).
7. Dispositif selon la revendication 5, caractérisé par le fait que l'élément de retenue est formé par deux saillies de retenue (14a et 14b) disposées côte à côte à une certaine distance (12) l'une de l'autre.
8. Dispositif selon la revendication 1, caractérisé par le fait que le corps de base est un corps (10, 13, 29) à surface extérieure au moins partiellement cylindrique.
9. Dispositif selon la revendication 1 et 8, caractérisé par le fait que l'élément de retenue (28) est une saillie sur la surface extérieure (34) du corps de base (29).
10. Dispositif selon la revendication 9, caractérisé par le fait que l'élément de retenue est un téton (28) radial, prévu au milieu de la surface enveloppe du corps cylindrique (29).
11. Dispositif selon la revendication 1, caractérisé par le fait que le corps cylindrique (29) présente des fentes de sécurité.
12. Dispositif selon la revendication 1 ou 8, caractérisé par le fait que le corps cylindrique (10, 13, 29) est fabriqué, comme partie séparée, par injection et est, en particulier, en polystyrène.
13. Dispositif selon l'une des revendications 1 à 10, caractérisé par le fait que les sections d'extrémité de la bande de guidage (27) sont munies d'ouvertures de fixation (30).
14. Dispositif selon l'une des revendications 8 à 13, caractérisé par le fait que le corps cylindrique (29) et la bande de guidage (27) forment une unité prête pour le montage.
15. Dispositif selon l'une des revendications 5 à 14, où l'appareil de transport de bande est une cassette de bande, caractérisé par le fait que l'élément de retenue est constitué au moins partiellement par une paroi de boîtier de la cassette (fig. 5b).
16. Dispositif selon la revendication 1 et l'une ou plusieurs des revendications 2 à 15, caractérisé par le fait que les sections d'extrémité (26, 26') sont reliées entre elles.
17. Dispositif selon les revendications 3, 5 et 16, caractérisé par le fait que la liaison des sections d'extrémité (26, 26') est réalisée de telle sorte qu'il se produit un bombement (w) de chaque section d'extrémité, partant de l'axe longitudinal.
18. Dispositif selon la revendication 1 et l'une des revendications 2 à 17 caractérisé par le fait que la bande de guidage est déformée (fig. 4c, 5b, 6b, 8) en prenant en coupe une forme d'oméga.
19. Dispositif selon la revendication 1 et l'une ou plusieurs des revendications 2 à 17 caractérisé par le fait que la bande de guidage insérée dans l'élément de retenue prend une forme de goutte ou de poire (fig. 4c, 7). ; 20. Cassette de bande, en particulier cassette de bande vidéo, munie d'un dispositif de guidage de bande selon l'une des revendications 1 à 19.
EP85116041A 1984-12-24 1985-12-16 Mécanisme de guidage de bande pour dispositifs d'entraînement de bande, particulièrement dispositifs de bande magnétique, et cassettes à bande avec ce mécanisme Expired EP0187319B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85116041T ATE44328T1 (de) 1984-12-24 1985-12-16 Bandfuehrungsvorrichtung fuer bandtransporteinrichtungen, insbesondere magnetbandeinrichtungen, und bandkassetten damit.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19848438028 DE8438028U1 (de) 1984-12-24 1984-12-24 Bandfuehrungsvorrichtung fuer bandtransporteinrichtungen insbesondere magnetbandeinrichtungen
DE8438028U 1984-12-24
DE19858516444 DE8516444U1 (de) 1985-06-05 1985-06-05 Bandführungsvorrichtung für Bandtransporteinrichtungen, insbesondere Magnetbandeinrichtungen
DE8516444U 1985-06-05

Publications (2)

Publication Number Publication Date
EP0187319A1 EP0187319A1 (fr) 1986-07-16
EP0187319B1 true EP0187319B1 (fr) 1989-06-28

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EP85116041A Expired EP0187319B1 (fr) 1984-12-24 1985-12-16 Mécanisme de guidage de bande pour dispositifs d'entraînement de bande, particulièrement dispositifs de bande magnétique, et cassettes à bande avec ce mécanisme

Country Status (4)

Country Link
US (1) US4736904A (fr)
EP (1) EP0187319B1 (fr)
JP (1) JPH0658758B2 (fr)
DE (1) DE3571285D1 (fr)

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JPS5834619Y2 (ja) * 1980-01-14 1983-08-03 ティーディーケイ株式会社 磁気テ−プカセット
JPS57122084U (fr) * 1981-01-21 1982-07-29
JPS57184583U (fr) * 1981-05-18 1982-11-24
JPS6016388U (ja) * 1983-07-11 1985-02-04 ティーディーケイ株式会社 磁気テ−プカセツト
JPS6193878U (fr) * 1984-11-27 1986-06-17

Also Published As

Publication number Publication date
US4736904A (en) 1988-04-12
DE3571285D1 (en) 1989-08-03
EP0187319A1 (fr) 1986-07-16
JPS61192093A (ja) 1986-08-26
JPH0658758B2 (ja) 1994-08-03

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